Psychological tests show that 18-year-old Isaiah has an intelligence score of 65. Nevertheless, Isaiah can, with a few seconds of mental calculation, accurately tell the day of the week on which Christmas falls for any year in this century. It would be fair to conclude that:.A) The intelligence test Isaiah was given has no validity.
B) Intelligence tests are generally good measures of verbal but not of mathematical intelligence.
C) Isaiah is a person with savant syndrome.
D) Isaiah excels in divergent thinking

C) Isaiah is a person with savant syndrome.

Explanation:

A savant syndrome is a mental condition that make a person perform extremely well on a specific task but extremely poorly on the rest. As per today, it is predicted that around 1 in million people has this condition.

This can be seen in the example above.

IQ test is designed to measure our brain's ability to solve different variety of mental problems . Isiah has a very low score because he is   unable to complete the overall common mental task as well as average children. But if judged based on the ability to do calculation alone, Isiah does remarkably well.

the above statement/question is (true);